An investigation has found there are no physical constraints to extending the Northern line to Clapham Junction, in a boost to the proposal.Wandsworth Council said there are no engineering or geological restrictions that would prevent the London Underground being extended to the busy station, after completing initial investigations into the proposal.The major station, managed by Network Rail, is home to the Overground and National Rail services, but it does not have an Underground line.Nine Elms and Battersea Power Station opened as the newest stations on the Northern line in 2021. Transport for London previously said it designed these stations in such a way that would allow for a further extension to Clapham Junction in the future, although it had no current plans to do so.A new report by council officers said extending the Northern line to Clapham Junction could attract more passengers, reduce overcrowding on existing services and support development in the area.